Preliminary results from VLT (FORS1) photometry of NGC 6397

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dc.creatorAndreuzzi, G.
dc.creatorTesta, V.
dc.creatorMarconi, G.
dc.creatorAlcaino, G.
dc.creatorAlvarado, F.
dc.creatorBuonanno, R.
dc.date2002-10-02
dc.date.accessioned2026-07-07T02:05:34Z
dc.date.available2026-07-07T02:05:34Z
dc.descriptionWe present VLT (FORS1) photometry of the lower main sequence (MS) of the Galactic Globular Cluster (GGC) NGC 6397, for stars located in 2 fields extending from a region near the cluster center out to ~ 10'. The obtained CMD shows a narrow MS extending down to V ~ 27 (figure c), much deeper than any previous ground based study and comparable with previous HST photometry (Cool et al. 1996). The comparison between observed MS Luminosity Functions (LFs) derived for 2 annuli at different radial distance from the center of the cluster shows a clear-cut correlation between their slope before reaching the turn-over, and the radial position of the observed fields inside the cluster area: the LFs become flatter with decreasing radius, a trend that is consistent with the interpretation of NGC 6397 as a dynamically relaxed system.
dc.description2 pages, 1 figure, uses newpasp.sty, to be published in ``New Horizons in Globular Cluster Astronomy'', ASP Conference Series, 2002; Eds.: G. Piotto, G. Meylan, G. Djorgowski and M. Riello
dc.identifierhttps://arxiv.org/abs/astro-ph/0210070
dc.identifierhttp://arxiv.org/abs/astro-ph/0210070
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/5138
dc.subjectAstrophysics
dc.titlePreliminary results from VLT (FORS1) photometry of NGC 6397
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